From patchwork Wed Jan 10 14:23:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= X-Patchwork-Id: 13516234 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7B9A9C4707B for ; Wed, 10 Jan 2024 14:25:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=A/uoaWJR+OPt/BiNSDWQdVbk2oZyh8mCPzYu9aQcr+I=; b=gUQCZzhaQou6cc T/+jdHOvzCYLv9Idr2Fj4VFBea0XjJY5mjspBvwwYQzcDxOu2numoMvLLAyUWhIl3XzX4hMDDI2lI 7xsIcTeGfOe67cPQzcSCf/n+yFstlWvtCGind78SlvabSqjxFEDLVAIgXJufi5aGz+Mxkkkw/XGUq 7H5sLBx2aj2GjEgGSOMVpK35A22HRYNQjxMHqVR08vJJBcQsC6ljVWEp+vDUsT/orzQ1qymp/UGa5 j10iQdYgPihXIU2KPwMM4XfEO8mYuYhnfcN6oXtFUt9VAWzqfkARqj4XHei4su/PinmWZdLqs2xls EwWaOt2zyq2V/oZevR2A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rNZWD-00CJ1Q-0C; Wed, 10 Jan 2024 14:25:21 +0000 Received: from madrid.collaboradmins.com ([2a00:1098:ed:100::25]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rNZW9-00CIzO-1n; Wed, 10 Jan 2024 14:25:18 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1704896714; bh=vwOsYK81Kz7ekPSjYz//FcETzOWODCjxJchEEfAb39s=; h=From:To:Cc:Subject:Date:From; b=D5B/bia0HVVwkZiV0SO4gzRNmHqonfK01qPchiAJpbfX5nI7JJQ2tgcRNDUrM/Pu1 wI2R0GxMa3nTsiPNsLq5dej97eMn+I9kcFXWTLHm76Rdmftx5E3BGVm74V5aha/+50 AvmIL7SjElDBUEitXy4RYk3t4Bn0W1y5T5I2gdUFnQZkvCYNtoDA9fAnQnHwGRmO8m lRl3FSYNYRzHpVcofQRSgoYrYpJmP/pvlAToPIDaEeUZG80EgFeHX+lqVGoN4TlsiE ZceLgY4fZxZCdA166gNLRIKjECmYdTiEh9H3R3kHnAIiaWPebjTu8xYV7zkeNESp6d kenMdZhU4HUug== Received: from localhost.localdomain (zone.collabora.co.uk [167.235.23.81]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: nfraprado) by madrid.collaboradmins.com (Postfix) with ESMTPSA id D94AE378045F; Wed, 10 Jan 2024 14:25:08 +0000 (UTC) From: =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= To: Viresh Kumar , "Rafael J . Wysocki" , AngeloGioacchino Del Regno , Matthias Brugger Cc: kernel@collabora.com, =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , Conor Dooley , "Hector.Yuan" , Krzysztof Kozlowski , Liam Girdwood , Mark Brown , Rob Herring , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-pm@vger.kernel.org Subject: [PATCH v2 0/2] Fixes for hang on MT8195-Tomato during mediatek-cpufreq-hw init Date: Wed, 10 Jan 2024 11:23:00 -0300 Message-ID: <20240110142305.755367-1-nfraprado@collabora.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240110_062517_759134_8083A3EC X-CRM114-Status: UNSURE ( 9.44 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org These two patches fix an issue observed on MT8195-Tomato where if the mediatek-cpufreq-hw driver enabled the hardware (by writing to REG_FREQ_ENABLE) before the SPMI controller driver (spmi-mtk-pmif), behind which lies the big CPU supply, probed the platform would hang shortly after with "rcu: INFO: rcu_preempt detected stalls on CPUs/tasks" being printed in the log. Changes in v2: - Moved supply phandles to CPU nodes in DT - Added fixes tags - Added patch to verify CPU supplies are available before proceeding in the mediatek-cpufreq-hw driver Nícolas F. R. A. Prado (2): arm64: dts: mediatek: cherry: Describe CPU supplies cpufreq: mediatek-hw: Wait for CPU supplies before probing .../boot/dts/mediatek/mt8195-cherry.dtsi | 32 +++++++++++++++++++ drivers/cpufreq/mediatek-cpufreq-hw.c | 19 ++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-)